A photoelectric surface is illuminated successively by monochromatic light of wavelength $\lambda $ and If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is (h = Planck's constant, C = speed of light)

Question

A photoelectric surface is illuminated successively by monochromatic light of wavelength $\lambda $ and If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is
(h = Planck's constant, C = speed of light)

${{2hc} \over \lambda }$

${{hc} \over {3\lambda }}$

${{hc} \over {2\lambda }}$

${{hc} \over \lambda }$

Solution

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